Johnathan,
It works ok for me, except for the mpsk_receiver with the setup from
http://www.nabble.com/QPSK-phase-noise-td22934944.html.
This is the constellation I get for a > 40 dB SNR BPSK:
http://www.nabble.com/file/p23060683/Screenshot.png Screenshot.png
Johnathan Corgan-2 wrote:
>
> G
Jonathan,
It works ok for me, except for the mpsk_receiver with the setup from
http://www.nabble.com/QPSK-phase-noise-td22934944.html.
This is the constellation I get for a > 40 dB SNR BPSK:
http://www.nabble.com/file/p23060668/Screenshot.png Screenshot.png
Johnathan Corgan-2 wrote:
>
> GN
For the plots I am just using the gr_plot_const.py FILENAME.dat where
FILENAME.dat comes from connnecting the block of interest using
self.connect(self.receiver, gr.file_sink(gr.sizeof_gr_complex,
"FILENAME.dat"))
For the costas loop and BPSK constellations I was using a custom script in
python t
Johnathan, you were right with the distortion issue at the TX, I am now using
these parameters:
./benchma-m dqpsk -f 1.25G -m dqpsk --tx-amplitude=500 -r 1M -M
--excess-bw=0.35
./benchmark_rx.py -r 1M -m dqpsk --log --costas-alpha=0.05 -S 4 --verbose -r
1M --gain-mu=0.01 --excess-bw=0.35
Thanks for your email Eric,
no, there is no underrun or overrun neither at the Tx or Rx side, the CPU
usage is really low (even with the loggin activated), i am running it on a
intel i7 processor.
you usually get a much sharper constellation, don't u?
On Tue, Apr 07, 2009 at 11:07:54AM -0700:
Dear All,
I am trying to demod a qpsk from another USRP but with the setup below I get
a really noisy constellation:
http://img231.imageshack.us/img231/2465/screenshotysh.png
The 2 USRPs are connected via a SMA cable with 40 db attenuators and DC
blocker.
I have also played with the costas alph
Hey Tom,
Congratulations!!, you totally deserve that and much more.
Paco.
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